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This article mainly introduces "how to solve the problem that the C++ compiler does not support concepts". In daily operation, I believe many people have doubts about how to solve the problem that the C++ compiler does not support concepts. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubt that "the C++ compiler does not support concepts". Next, please follow the editor to study!

T.48: if your compiler does not support concepts, use enable_if to emulate it

Reason (reason)

Because that's the best we can do without direct concept support. Enable_if can be used to conditionally define functions and to select among a set of functions.

Because this is the best practice that can be taken when direct support for concept cannot be active. Enable_if can be used to conditionally define functions and choose from a set of functions.

Example (sample)

Template

Enable_if_t

F (T v)

{

/ /...

}

/ / Equivalent to:

Template

Void f (T v)

{

/ /...

} Note (note)

Beware of complementary constraints. Faking concept overloading using enable_if sometimes forces us to use that error-prone design technique.

Avoid complementary constraints. Using enable_if to simulate conceptual overloading sometimes requires us to use error-prone design techniques.

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